Marineland Rite-Size A Cartridge Refills， 12-Pack (2 packs with 6 filters per pack)， Aquarium Penguin Power Filter Cartridges</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>12-Pack (2 Packages with 6 Filters Per Package) Marineland Rite-Size Cartridge A</li><li>Each cartridge is pre-assembled</li><li>Meets the highest standards of water purification and operational ease</li><li>Rite-Size A fits Penguin 100B， Mini， and 99B.Rite-Size B fits Penguin 150B， 110B， and 125B.Rite Size C fits Penguin 200B， 350B， 170B， and 330B.</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/51M38l6MtJL.jpg' noproxy></br>